Shoe sewing machine



SHOE SEWING MACHINE Original Filed Jan. 14, 1935 3 Sheets-Sheet 1 Fig.1

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Patented Apr. 21, 1936 SHOE SEWING MACHINE Otto R. Haas, North Beverly,Mass., assignor to United Shoe Machinery Corporation, Paterson, N. J., acorporation of New Jersey Original application January 14, 1933, SerialNo. 651,803. Divided and this application January 5, 1935, Serial No.545

16 Claims. (Cl. 117-47) The present invention relates to lockstitch shoesewing machines for connecting the outsole with the welt, lasted upperand insole of a. Goodyear welt shoe, the illustrative embodiment of theinvention being of the same construction and operation as that of themachine described in applicants pending application Serial No. 651,803,filed January 14, 1933, of which the present application is a division.

The object of the present invention is to improve the construction,arrangement, and mode of operation of the stitch forming parts ofoutsole shoe sewing machines.

With the'above and other objects in View, as

' will hereinafter appear, certain features of the present inventioncontemplate the provision in an outsole shoe sewing machine of a new andimproved carrier stud construction upon which a needle supportingsegment is mounted for oscillating and feeding movements; a new andimprovedmechanism, in a machine having the needle and awl segments and aneedle guide, all

mounted to oscillate upon a single stud, for operating the needle guidethrough friction from the needle segment, and when so arranged formodifying by engagement with some other member of the stitch-formingdevices, such as the thread arm, the operation of the needle guide tocover the barb of the needle as soon as the thread has been withdrawn,and a new and improved arrangement for providing support for the end ofthe needle while feeding the work by operating the needle threadinglooper in suitable timed relation to the other stitch forming and workfeeding movements.

These and other features of the invention, including certain novel andimproved constructions and arrangements of parts are hereinafterdescribed in the following detailed specification, and are moreparticularly pointed out in the appended claims.

In the drawings, Fig. l is a view in side elevation and in section of asewing machine embodying the features of the present invention; Fig. 2is a plan view partly broken away and in section of the front part ofthe machine; Fig. 3 is an enlarged view in elevation and partly insection of the stud on which the needle and awl segments of the machineare mounted and of the adjacent parts; Fig. 4 is a detail View insection of the needle and awl mounting stud and its oscillating segment;Fig. 5 is an end View of the needle and awl stud oscillating segmentshown in Fig. 4; and Fig. 6 is a sectional view of the stud shown inFig. 4 taken at right angles to the section shown in that figure.

The sewing mechanism of the machine embodying the present invention issubstantially the same except as hereinafter described, as in themachine of applicants co-pending application Ser. No. 600,016, filedMarch 19, 1932, for Shoe sewing machines. The machine illustrated isoperated from a sewing cam shaft in to actuate the stitch-forming andwork feeding devices of the machine including a curved hook needle l2, acurved awl 14, a looper I6, a shuttle or loop taker 18, a thread finger20, a needle guide 22, a work support 24, a presser foot 26 and a feedslide 28 on which certain of the stitch-forming devices are carried. Thestitch-forming and work-feeding devices are constructed and arranged toimpart a continuous feeding movement to the work as in the machine ofapplicants co-pending application Serial No. 600,016, and to this endthe work support and presser-foot are mounted upon a laterally slidingcarriage or feed slide, and the needle and awl are also mounted upon thecarriage but, at certain times during the stitchforming and work-feedingcycle, are moved in the line of feed independently of the carriage. Theback feed of the feed carriage takes place while the needle is in thework and the awl is arranged to enter the work after the back-feed ofthe feed carriage has been completed and after the needle has withdrawnfrom the work with its loop of thread.

According to a feature of the present invention the awl segment,indicated at 30 (see Fig. 3) and the needle segment, indicated at 32, asin the machine of application Serial No. 600,016 referred to, aremounted for movement in the line of feed independently of thefeed slide28 on which they are supported. These segments are separatelyoscillatable and are mounted with the needle and awl in fixed alinementon a carrier stud 34 having at one end a threaded portion 36 engaging athreaded bearing 38 formed in the slide 128. The needle is secured forconvenient replacement on the segment 32 by a clamp member 30 betweenwhich and the segment there is provided a clamp releasing spring 42. Theother end of the stud 34 is supported in a plain bearing 44 in a fixedpart of the machine frame 46 which bearing is engaged by the sleeve ofthe awl segment. Feed ing movement of the feed slide is effected by thecam shaft through a cam lever 48 adjustably connected to the feed slide28 by links 50. The stud with the needle and awl are independentlymovable in the line of feed relatively to the feed slide 28, by rotationof the stud in the threaded bearing 38 through the engagement of asegment 52 extending from the stud with the teeth of a correspondingsegment 54 fixed to a short horizontal shaft 56 in the front portion ofthe sewing frame. The shaft 56 is oscillated by an arm 58 secured to theother end of the shaft, the arm 58 being actuated through a link 60connected between the arm 58 and one end of a lever 62 operated by a camon the sewing cam shaft.

It is desirable that the carrier stud 34 on which the needle and awlsegments oscillate be as short as possible while providing suflicientbearing areas to properly support the moving parts; The thread on thethreaded portion 36 of the stud .is, therefore, extended from theextreme end of the stud to the shoulder formed by the segment 52, andpreferably the thread is of full depth up to this shoulder.

According to the construction illustrated in Figs. 4, 5, and 6, thesegment 52 on the carrier stud is formed separately and secured to thecarrier stud, in order that the thread on the threaded portion 36 of thestud may be accurate and of full depth. The stud 34 is reduced indiameter and is in the form of a bolt having its threaded journalportion 36 at one end, a thread at the other end to accommodate a nut54, and an abrupt shoulder between the journal portion and theunthreaded portion. The segment 52 is formed with an extended sleeveportion surrounding the stud 34 throughout the entire length of thereduced portion, which sleeve provides support for the needle and awlsegments. The stud 34 is connected for rotation with the segment 52 by atongue 66 on the stud and a slot in the end face of the segment. Thetongue 66 extends axially from the shoulder between the threaded portion36 and the reduced bolt portion of the stud, so that when the nut 64together with a washer 68 are applied to the stud, the tongue will beclamped within the slot in the segment, and the threaded portionextending beyond the segment will be of full depth to the end face ofthe segment. The washer 68 extends radially beyond the outer surface ofthe stud to retain the needle and awl segments and the needle guide infixed relation longitudinally of the stud.

In order to provide more space for the operating connections for theneedle and awl segments, and to permit a greater movement of the needle,the needle guide 22 which, in the machine of application Serial No.600,016, was driven positively from a cam actuated part, in the presentmachine is driven from the needle segment 32 by friction. The needleguide is actuated positively by the thread finger 28 to cover the emptybarb of the needle as soon as the thread has been withdrawn. Theposition of these segments has been reversed on the stud 34 from thosein the machine of application Serial No. 600,016, in order that theneedle guide may be located close to the thread finger. The needlesegment 32, therefore, is disposed at the left hand side of the awlsegment 3!), and is formed with an arcuate inner surface 10, shown inFig. 1, against which a shoe 12 mounted on the needle guide iscompressed. A stud 74 extending from the shoe 12 engages a bore in anarm 76 of the needle guide, and compresses a coil spring 18 against theend of the bore. The frictional engagement produced by the springbetween the shoe i2 and the surface it causes the needle guide to followthe movements of the needle until the needle guide contacts with asurface 80 on the presser-foot. Thereafter the needle guide remainsstationary, and the needle continues its movement through the work.

The lowermost position of the needle guide by this construction isdetermined by the position of the presser-foot on the work. The stitchforming devices which act to produce a continu ous feed of the work areso timed that the presserfoct and work support will be back fed whilethe needle engages the work and while the needle guide supports theneedle close to the surface of the work. As in the machine of the aboveidentified application Serial No. 600,016, the presserfoct is raisedduring sewing at the first portion of each back feeding movement. Inorder to facilitate raising the presser-foot, the surface 80 of thepresser-foot which the needle guide engages (see Fig. 3) is inclined atan angle, and a correspondingly inclined surface 82 on the needle guidepermits the presser-foot to be raised with a minimum amount ofinterference with the needle guide as the presser-foot moves against thedirection of feed and away from the needle guide.

During the retracting movement of the needle, the needle guide movesvertically away from the presser-foot until a stop arm 84 (see Fig. l)on the needle guide engages a projection 86 extending laterally from aportion of the thread finger. The needle guide then remains stationaryuntil the needle is fully retracted, and after the thread has beenwithdrawn from the barb of the needle, the thread finger is movedrearwardly by its actuating lever 88, causing the projection 86 on thethread finger to shift the needle guide over the barb of the needle, asshown, so that the loop of needle thread in passing over the shuttlewill not become entangled with the open barb. In order that the needleguide may not be carried beyond the end of the needle, a shoulder 90 isprovided on the needle segment in a position to engage the end of thestop arm 84 on the needle guide.

To insure that the needle guide 22 will move with the needle and willnot momentarily shift its position from covering the needle barb inspite of the action of the friction shoe I2 as the needle is acceleratedin its movement towards the work, means is provided for actuating itpositively during a part of the needle stroke. To this end the threadfinger 20 is given a further short rearward stroke causing the needleguide to be accelerated as fast as the needle. The needle barb will thusremain covered until the needle guide strikes the presserfoot and theneedle engages the work even though the machine is operated at extremelyhigh speeds.

While the work support and presser-foot are being back-fed, as shown inFig. 3, the needle. which, at this time, is through the work, issupported at its lower end against the thrust of the work, produced bythe frictional reaction of the Work on the work support, by the loop ofthread which is laid within the barb of the needle by the looper beforethe work is released by the presserfoot. In laying the loop within theneedle barb,

the thread is first grasped by the thread finger 20,

the looper then moving forwardly of the machine and against thedirection of feed toward the needle, and then rearwardly of the machineround the needle and in the direction of feed to exert a strain on theneedle. The strain is maintained throughout the entire back-feedingmovement of the work support and presser-foot, so that the needle maynot flex or become broken, and the distance between stitches in the workwill be uniform.

To permit the use of a comparatively short geared portion on the needlesegment, a pair of idler gears 92 and 94 (see Fig. 1) are rotatablymounted on bolts 96 secured on the feed slide 28 to mesh with the needlesegment in either of its extreme positions. The idler gears 92 and 94are driven by a segment 98 fulcrumed on a hollow shaft I in the frame ofthe machine, so that during the feeding movements of the feed slide andof the stud 34, the idler gears 92 and 94 may move in the line of feedrelative to the segment 98, and the needle segment may also moverelative to the idler gears in the feed slide. The segment 98 isoscillated by a cam follower carried by an arm I02 extending from thesegment.

The shuttle I8 of the illustrated machine is similar to the shuttle ofapplicants co-pending application Serial No. 600,016, and is driven fromthe main sewing shaft I 0 through a second shaft I04 extending towardthe front of the machine. The outer end of the second shaft carries agear I06 meshing with gear teeth formed about the edge of the shuttleI8.

To prevent breakage of the driving connections between the sewing shaftand the shuttle, in the present embodiment of the invention, the gearI06 at the outer end of the shaft I04 is constructed in the form of aring having a flange extending radially inwardly towards the center ofthe gear, as shown in Fig. 1. The ring is positioned at the end of theshaft I04 by a disk I08 at the end of the shaft fitting within acircular recess at one side of the flange. A plate IIO fits at the otherside of the flange, and the parts are secured by screws I I2 passingthrough the plate and the central opening in the ring gear and en.-gaging the disk at their threaded ends. The force exerted by the screwsordinarily prevents rotation of the ring gear relative to the shaft I04,but in case of obstruction by thread jamming the shuttle or otherwise,the flange on the gear ring will slide between the plate and the diskwithout injuring theparts. The screws I I 2 are also readily accessibleat the front of the machine adjacent the shuttle for readjusting thetiming of the shuttle in case the gear is displaced.

The nature and scope of the invention having been indicated and aspecific embodiment illustrating the several features of the inventionhaving been described, what is claimed is:

1. A sewing machine having, in combination, stitch-forming andwork-feeding devices including a stud provided with a screw threadedportion engaging a screw threaded bearing in the machine, a curved hookneedle, a needle segment mounted to oscillate on the stud, means forsupporting the needle segment in fixed relation longitudinally of thestud, and a separately formed stud oscillating segment secured to thestud at one side of the screw threaded portion and having a shoulder towhich screw threads of the screw threaded portion of full depth extend.

2. A sewing machine having, in combination, stitch-forming and workfeeding devices including a stud provided with a screw threaded. portionengaging a screw threaded bearing in the machine, a curved hook needle,a needle segment mounted to oscillate on the stud, means for supportingthe needle segment in fixed relation longitudinally of the stud, and aseparately formed stud oscillating segment having a sleeve portionsurrounding the unthreaded portion of the stud to form a radial bearingfor the needle segment and having a shoulder to which screw threads ofthe screw threaded portion of full depth extend.

3. A sewing machine having, in combination, stitch-forming and workfeeding devices including a stud provided at one end with an enlargedscrew threaded portion engaging a screw threaded bearing in the machineand formed with a tongue adjacent the shoulder between the enlargedportion of the stud and the remaining portion, a curved hook needle, aneedle segment mounted to oscillate on the stud, means for supportingtheneedle segment in fixed relation: longitudinally of the stud, and aseparately formed segment having a slotted face engaging the tongue on.the stud for oscillating the stud in the threaded bearing to feed thework.

4. A sewing machine having, in combination, stitch-forming andwork-feeding devices including a stud provided at one end with anenlarged screw threaded portion engaging a screw threaded bearing in themachine and a reduced portion,

threaded at the other end, a tongue extending axially from the enlarged:threaded portion at the shoulder formed thereby, a curved. hook needle,a.

needle segment mounted to oscillate on the stud, a separately formedsegment having a sleeve portion to forma radial bearing for the needlesegment surrounding the reduced portion of the stud, said separatelyformed segment having a slotted face engaging the tongue on the stud foroscillating the stud in the threaded bearing to feed the work, and meanscomprising a nut at the reduced threaded end of the stud for securingthe stud and segment with the sleeve portion in fixed relation and. forpreventing movement of the needle segment longitudinally of the stud.

5. A lockstitch sewing machine having, in combination, a loop taker, acarrier stud, a curved.

hook needle, a curved awl, needle and awl segments and a needle guidemounted to oscillate on the stud, means for supporting the needle andawl segments in fixed relation longitudinally of the stud, and means foroperating the needle guide frictionally from the needle segment to causethe needle guide to support the needle adjacent the work as the needlemoves forwardly into the work, a thread arm, and a connection betweenthe needle guide and the thread arm for shifting the needle guide on theneedle to cover the open barb after the loop of needle thread has beentaken therefrom.

6. A sewing machine having, in combination, stitch forming devicesincluding a curved hook needle and a loop taker, a needle guide, aneedle segment in which the needle is mounted, means for frictionallydriving the needle guide from the needle segment, and means for movingthe needle guide tocover the empty hook of the needle after the loop ofneedle thread has been taken from the hook and for thereafter actuatingthe needle guide to move with the needle.

'7. A sewing machine having, in combination, stitch forming devicesincluding a curved hook needle, a looper, a thread arm, and a looptaker, a needle guide, a needle segment in which the needle is mounted,a friction shoe carried by the needle guide and engaging the needlesegment to drive the needle guide from the segment, and means foractuating the thread arm to move the needle guide over the empty book ofthe needle after the loop of needle thread has been taken from the hook,and thereafter to cause the needle guide to move with the needle beforeit engages the work.

8. A sewing machine having, in combination, a carrier slide mounted toreciprocate in the line of feed, a work support, a presser-foot and athread arm on the slide, a stud provided with a screw thread engaging ascrew threaded bearing in the slide, needle and awl segments and a 1ment to cause the needle guide to follow the movements of the needletoward and away from the work.

9. A lockstitch sewing machine having, in combination, a carrier slidemounted to reciprocate in the line of feed, a work support, apresserfoot and a thread arm on the slide, a stud provided with a screwthread engaging a screw threaded bearing in the slide, needle and awlsegments and a needle guide mounted on the stud, mechanism forreciprocating the slide and for oscillating the stud in timed relationto produce continuous feed of the work, means for driving the needleguide from the needle segment, a loop taker, and a connection betweenthe needle guide and the thread arm arranged to shift the needle guideon the needle to cover the open barb after the loop of needle thread hasbeen taken therefrom.

10. A lockstitch sewing machine having, in combination, a carrier slidemounted to reciprocate in the line of feed, a work support, apresserfoot and a thread arm on the slide, a stud provided with a screwthread engaging a screw threaded bearing in the slide, needle and awlsegments and a needle guide mounted on the stud, mechanism forreciprocating the slide and for oscillating the stud in timed relationto pro duce continuous feed of the work, means for driving the needleguide from the needle segment, a loop taker, a connection between theneedle guide and the thread arm arranged to shift the needle guide onthe needle to cover the open barb after the loop of needle thread hasbeen taken therefrom, and a stop on the needle segment for preventinrelative movement of the needle guide by the thread arm beyond the pointof the needle.

11. A lockstitch sewing machine having, in combination, a carrier slidemounted to reciprocate in the line of feed, a work support, apresserfoot and a thread arm on the slide, a stud provided with a screwthread engaging a screw threaded bearing in the slide, a gear segmentsecured to the stud, a curved hook needle and a curved awl, means forthreading the needle, needle and awl segments and a needle guide mountedto oscillate on the stud, means for supporting the needle and awlsegments in fixed relation longitudinally of the stud, a cam shaft foroscillating the needle and awl segments, mechanisrn operated from thecam shaft for reciproeating the carrier slide, a gear segment operatedfrom the cam shaft for oscillating the stud in timed relation to thereciprocating movement of the carrier slide to produce continuous feedof the work, a connection between the thread arm and the needle guidefor shifting the needle guide relative to the needle, a loop taker, andmeans on the cam shaft for causing the thread arm to retract before theneedle is threaded and for causing the thread arm to move'the needleguide over the open needle barb after the loop of needle thread has beentaken from the needle.

12. A shoe sewing machine having, in com bination, stitch-forming andwork feeding devices including a curved hook needle, movable laterallyof the machine along the line of work feed, a work support, a workclamping presser foot, mechanism for operating the presser foot torelease the work and for moving the needle while through the worklaterally in the line of feed relatively to the work support, and meansacting to support the needle at its end during the entire time that thework is released from the presser-foot. V

13. A shoe sewing machine having, in combination, stitch-forming andwork feeding devices including a curved hook needle, movable laterallyof the machine along the line of feed, a needle looper, a work supportand a work clamping presser-foot, and mechanism for operating thepresser-foot intermittently to release the work, and means for movingthe needle laterally in the line of feed relatively to the work supportduring each stitch-forming cycle of operation to feed the work and foractuating the looper forwardly and rearwardly to lay the thread withinthe barb of the needle before the presser-foot is operated to releasethe work.

14. A shoe sewing machine having, in combination, stitch-forming andwork-feeding devices including a work support, a work clampingpresser-foot, a curved hook needle, mechanism for operating thepresser-foot intermittently to release the work and for relativelymoving the presser-foot and needle during each stitch-forming cycle ofoperation to feed the work while the needle engages the work, and aneedle guide arranged to engage the presser-foot while the needleengages the work, said needle guide and presser-foot having parallelengaging surfaces disposed at an angle to the direction of feed forpermitting release of the presser-foot from clamping relation with thework without interiering with the needle guide as the presser-foot ismoved away from the needle guide.

15. A shoe sewing machine having, in combination, stitch-forming andwork feeding devices including a work support, a work clampingpresser-foot, a carrier movable laterally of the machine along the lineof work feed, a curved hook needle mounted on the carrier for movementtoward and from the work, mechanism for operating the presser-footintermittently to release the work and for moving the carrier while theneedle engages the work in the direction of feed to feed the work, and aneedle guide mounted on the carrier for movement against thepresser-foot while the work is clamped thereby, said needle guide andpresser-foot having engaging surfaces disposed at an angle to thedirection of feed for permitting release of the presser-foot fromclamping relation with the work without interfering with the needleguide as the carrier is back fed.

16. A sewing machine having, in combination, stitch forming devicesincluding a carrier slide mounted to reciprocate in the line of feed, awork support and a presser-foot on the slide, a stud, needle and awlsegments on the stud, mechanisms for reciprocating the slide and forreciprocating the stud on the slide in timed relation to producecontinuous feeding movement of the work, an oscillating segmentrotatable on the machine frame for actuating the needle segment, and anintermediate pinion rotatably mounted on the slide between the needlesegment and the oscillating segment.

OTTO R. HAAS.

